[ISSUE #662] Fix the usage bug of namespace

[Git-Yang]

#662

What is the purpose of the change

• 批量消息Namespace使用错误，需要对所有消息topic添加Namespace

Brief changelog

• sendSync / sendAsync / sendOneWay 三个接口发送消息时，遍历所有msg，对topic添加Namespace

Verifying this change

By unit test

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[codecov-commenter]

Codecov Report

Merging #665 (3eb9052) into master (dfa26d1) will increase coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #665      +/-   ##
==========================================
+ Coverage   24.36%   24.51%   +0.15%     
==========================================
  Files          48       48              
  Lines        5204     5204              
==========================================
+ Hits         1268     1276       +8     
+ Misses       3726     3721       -5     
+ Partials      210      207       -3     

Impacted Files	Coverage Δ
producer/producer.go	28.12% <100.00%> (+1.87%)	⬆️
producer/option.go	42.22% <0.00%> (+4.44%)	⬆️

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